Negabackwardscrystals are theoretical crystals which conduct negative energy in the opposite direction of normal negacrystals. They have never been discovered despite the known existence of antinegabackwardscrystals and are the most coveted physical object in the scientific world of the multiverse. If one were to gain access to a negabackwardscrystal one could effectively create a negative energy perpetual motion machine, which due to the superluminal nature of negative energy would result in a perpetual motion machine projecting indefinitely into the past beyond the range of current time machines (see hyperinfinite time, would-have-been, and alternate timeline).

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